FARM MOTORS 



he was able to make very exhaustive experiments with- 

 out being retarded by atmospheric conditions. He made 



FIG. 2O6 SECTIONAL WHEEL WITH CENTRIFUGAL GOVERNOR AND 

 INDEPENDENT RUDDER 



tests with over 60 different forms of wheels, and it was 

 the result of these experiments which brought out the 

 steel wheel. From Mr. Perry we learn that in wood wheels 

 the best angle of weather is about 30, and that there 

 should be a space of about one-eighth the width of the sail 

 between the sails. By angle of weather is meant the 

 angle made by the blade and the plane normal or perpen- 

 dicular to the direction of the wind. With the tower in 



